package com.xxx.interceptor;

import ch.qos.logback.core.joran.action.AppenderAction;
import com.xxx.config.AppConfig;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * 拦截器
 */
@Component
public class LoginInterceptor implements HandlerInterceptor {
    @Value("${bit-forum.login.url}")
    private String defaultUrl;
    /**
     * 前置处理
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //获取session
        HttpSession session = request.getSession(false);
        //判断session是否有效
        if(session != null && session.getAttribute(AppConfig.USER_SESSION) != null){
            //用户已登录
            return true;
        }
        if(!defaultUrl.startsWith("/")){
            defaultUrl = "/" + defaultUrl;
        }
        //校验不通过, 跳转到登录页面
        response.sendRedirect(defaultUrl);
        return false;
    }
}
